Tested 20180905+dfsg1-0ubuntu1~14.04.0 on Trusty:
root@t:~# apt show gce-compute-image-packages | grep rsyslog
WARNING: apt does not have a stable CLI interface yet. Use with caution in scripts.
Recommends: rsyslog | system-log-daemon
Tested 20180905+ dfsg1-0ubuntu1~ 14.04.0 on Trusty:
root@t:~# apt show gce-compute- image-packages | grep rsyslog
WARNING: apt does not have a stable CLI interface yet. Use with caution in scripts.
Recommends: rsyslog | system-log-daemon